Nienhagen, Lower Saxony

{{Infobox German location

|name = Nienhagen

|image_coa = Wappen Nienhagen (Landkreis Celle).png

|coordinates = {{coord|52|33|N|10|6|E|format=dms|display=inline,title}}

|image_plan = Nienhagen in CE.svg

|state = Niedersachsen

|district = Celle

|Samtgemeinde = Wathlingen

|elevation = 41

|area = 17.57

|postal_code = 29336

|area_code = 05144

|licence = CE

|Gemeindeschlüssel = 03 3 51 018

|divisions = 3 Ortsteile

|website = [http://www.nienhagen.de/nhg/index.html www.nienhagen.de]

|mayor = Jörg Makel

|party = SPD

}}

Nienhagen is a municipality in the district of Celle, in Lower Saxony, Germany.